UV Index
UV Index
Today's UV index in Hanoi, Vietnam 
will be up to 12.6, indicating a extreme level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-06-01
UV index at 12.6 in Hanoi means extreme risk: limit outdoor time especially from 10 a.m. to 4 p.m., actively seek shade, wear protective clothing, broad-brimmed hat, apply SPF 30+ sunscreen every 2 hours, and wear UV-blocking sunglasses. Watch for bright surfaces like water and snow increasing UV exposure.
Hanoi's UV index is usually moderate to high, peaking around midday especially in spring and summer months. UV levels tend to be lower during the rainy season in late summer and autumn.
Hanoi has hot, humid summers with heavy rain from May to September. Winters from November to February are cooler and drier. Spring and autumn are mild and pleasant with less rain.
Compared to other parts of Vietnam, Hanoi experiences cooler winters due to its northern location. Its rainy season is more concentrated than in southern Vietnam. Neighboring countries like Laos and Cambodia have similar tropical monsoon climates but with less winter chill.
See the UV index hour by hour for Hanoi, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.